(SKU:RB-03T006)NRF24L01無線數(shù)傳模塊
來自ALSROBOT WiKi
目錄 |
產(chǎn)品概述
NRF24L01是一款新型單片射頻收發(fā)器件，工作于2.4 GHz～2.5 GHz ISM頻段。內(nèi)置頻率合成器、功率放大器、晶體振蕩器、調(diào)制器等功能模塊，并融合了增強型ShockBurst技術，其中輸出功率和通信頻道可通過程序進 行配置。NRF24L01功耗低，在以-6 dBm的功率發(fā)射時，工作電流也只有9 mA；接收時，工作電流只有12.3 mA，多種低功率工作模式(掉電模式和空閑模式)使節(jié)能設計更方便。
規(guī)格參數(shù)
- 2Mbit/s速率下接收時的峰值電流12.5mA
- 在2Mbit/s速率下@0dBm輸出時的峰值電流11mA
- 掉電模式下的功耗400nA
- 待機模式下的功耗32uA
- 130us 的快速切換和喚醒時間
- 具有片內(nèi)穩(wěn)壓器oltage regulators
- 可在1.9 to 3.6V低電壓工作
- MultiCeiverMT硬件提供同時6個接收機的功能，2Mbit/s 使得高質(zhì)量的VoIP成為可能
使用方法
引腳說明
引腳說明：
- CE：使能發(fā)射或接收；
- CSN、 SCK、 MOSI、 MISO： SPI引腳，通過此引腳配置nRF24L01
- IRQ：中斷
應用例程
1.庫文件下載
NRF2401庫文件及使用例程下載地址
2.連接Arduino和NRF2401模塊
連接注意事項：
- VCC引腳的電壓范圍2.3 - 3.6之間，超過 3.6V 模塊會燒掉， 建議使用3.3V左右。
- 該模塊也可以通過普通 IO 口模擬 SPI 時序進行讀寫數(shù)據(jù)操作。
- 使用 2 個模塊同時發(fā)射時，兩者頻道間隔應該至少相差1MHZ,否則同頻道之間易干擾。
| NRF2401 | Arduino |
| VCC | 3V3 |
| GND | GND |
| CSN | D9 |
| CE | D8 |
| MOSI | D11 |
| MISO | D12 |
| SCK | D10 |
| IRQ | D13 |
3.代碼下載
發(fā)送端代碼
/*********************************************************************
** Device: nRF24L01+ TX **
** SPI*********** **
** CE - to digital pin 8 **
** CSN - to digital pin 9 (SS pin) **
** CLK - to digital pin 10 (SCK pin) **
** MOSI - to digital pin 11 (MOSI pin) **
** MISO - to digital pin 12 (MISO pin) **
** IRQ - to digital pin 13 **
*********************************************************************/
#include "NRF24L01.h"
//***************************************************
#define TX_ADR_WIDTH 5 // 5 unsigned chars TX address width
#define RX_ADR_WIDTH 5 // 5 unsigned chars RX address width
#define TX_PLOAD_WIDTH 32 // 32 unsigned chars TX payload
#define RX_PLOAD_WIDTH 32 // 32 unsigned chars RX payload
unsigned char TX_ADDRESS[TX_ADR_WIDTH] =
{
0x34,0x43,0x10,0x10,0x01
}; // Define a static TX address
unsigned char RX_ADDRESS[RX_ADR_WIDTH] =
{
0x34,0x43,0x10,0x10,0x01
}; // Define a static RX address
unsigned char TX_BUF[TX_PLOAD_WIDTH]={0};
//***************************************************
void setup()
{
SPI_DIR = ( NRFCE + NRFSCK + NRFCSN + NRFMOSI);
SPI_DIR &=~ ( NRFIRQ + NRFMISO);
delay(100);
init_io();
init_NRF24L01();
Serial.begin(9600);
TX_BUF[1] = 0x01 ;
TX_BUF[2] = 0x02 ;
nRF24L01_TxPacket(TX_BUF);
delay(50);
}
void loop()
{
unsigned char status=0;
// status=SPI_Read(STATUS);
// if(status&TX_DS)
for(; ;)
{
TX_BUF[1] = 0x01 ;
TX_BUF[2] = 0x02 ;
Serial.println("****************START TX**********************");
Serial.print("TX_BUF[1]=0x");
Serial.println(TX_BUF[1],HEX);
Serial.print("TX_BUF[2]=0x");
Serial.println(TX_BUF[2],HEX);
delay(1000);
nRF24L01_TxPacket(TX_BUF); // Transmit Tx buffer data
SPI_RW_Reg(WRITE_REG+STATUS,0XFF);
TX_BUF[1] = 0x00;
TX_BUF[2] = 0x00;
}
}
//**************************************************
// Function: init_io();
// Description:
// flash led one time,chip enable(ready to TX or RX Mode),
// Spi disable,Spi clock line init high
//**************************************************
void init_io(void)
{
SPI_PORT&=~NRFCE; // chip enable
SPI_PORT|=NRFCSN; // Spi disable
SPI_PORT&=~NRFSCK; // Spi clock line init high
}
/**************************************************
* Function: SPI_RW();
*
* Description:
* Writes one unsigned char to nRF24L01, and return the unsigned char read
* from nRF24L01 during write, according to SPI protocol
**************************************************/
unsigned char SPI_RW(unsigned char Byte)
{
unsigned char i;
for(i=0;i<8;i++) // output 8-bit
{
if(Byte&0x80)
{
SPI_PORT |=NRFMOSI; // output 'unsigned char', MSB to MOSI
}
else
{
SPI_PORT &=~NRFMOSI;
}
SPI_PORT|=NRFSCK; // Set SCK high..
Byte <<= 1; // shift next bit into MSB..
if(SPI_IN & NRFMISO)
{
Byte |= 1; // capture current MISO bit
}
SPI_PORT&=~NRFSCK; // ..then set SCK low again
}
return(Byte); // return read unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_RW_Reg();
*
* Description:
* Writes value 'value' to register 'reg'
/**************************************************/
unsigned char SPI_RW_Reg(unsigned char reg, unsigned char value)
{
unsigned char status;
SPI_PORT&=~NRFCSN; // CSN low, init SPI transaction
status = SPI_RW(reg); // select register
SPI_RW(value); // ..and write value to it..
SPI_PORT|=NRFCSN; // CSN high again
return(status); // return nRF24L01 status unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_Read();
*
* Description:
* Read one unsigned char from nRF24L01 register, 'reg'
/**************************************************/
unsigned char SPI_Read(unsigned char reg)
{
unsigned char reg_val;
SPI_PORT&=~NRFCSN; // CSN low, initialize SPI communication...
SPI_RW(reg); // Select register to read from..
reg_val = SPI_RW(0); // ..then read register value
SPI_PORT|=NRFCSN; // CSN high, terminate SPI communication
return(reg_val); // return register value
}
/**************************************************/
/**************************************************
* Function: SPI_Read_Buf();
*
* Description:
* Reads 'unsigned chars' #of unsigned chars from register 'reg'
* Typically used to read RX payload, Rx/Tx address
/**************************************************/
unsigned char SPI_Read_Buf(unsigned char reg, unsigned char *pBuf, unsigned char bytes)
{
unsigned char status,i;
SPI_PORT&=~NRFCSN; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status unsigned char
for(i=0;i<bytes;i++)
{
pBuf[i] = SPI_RW(0); // Perform SPI_RW to read unsigned char from nRF24L01
}
SPI_PORT|=NRFCSN; // Set CSN high again
return(status); // return nRF24L01 status unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_Write_Buf();
*
* Description:
* Writes contents of buffer '*pBuf' to nRF24L01
* Typically used to write TX payload, Rx/Tx address
/**************************************************/
unsigned char SPI_Write_Buf(unsigned char reg, unsigned char *pBuf, unsigned char bytes)
{
unsigned char status,i;
SPI_PORT&=~NRFCSN; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status unsigned char
for(i=0;i<bytes; i++) // then write all unsigned char in buffer(*pBuf)
{
SPI_RW(*pBuf++);
}
SPI_PORT|=NRFCSN; // Set CSN high again
return(status); // return nRF24L01 status unsigned char
}
/**************************************************/
/***************************************************
* Function: nRF24L01_TxPacket(unsigned char * tx_buf)
* Description:
* sent tx_buf data
/**************************************************/
void nRF24L01_TxPacket(unsigned char * tx_buf)
{
SPI_PORT&=~NRFCE; //StandBy I mode
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, TX_ADDRESS, TX_ADR_WIDTH);
SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH);
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0e);
SPI_PORT|=NRFCE;
delay(10);
}
/**************************************************
* Function: init_NRF24L01();
*
* Description:
* This function initializes one nRF24L01 device to
* TX mode, set TX address, set RX address for auto.ack,
* fill TX payload, select RF channel, datarate & TX pwr.
* PWR_UP is set, CRC(2 unsigned chars) is enabled, & PRIM:TX.
*
* ToDo: One high pulse(>10us) on CE will now send this
* packet and expext an acknowledgment from the RX device.
**************************************************/
void init_NRF24L01(void)
{
SPI_PORT&=~NRFCE;
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // Writes TX_Address to nRF24L01
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH); // RX_Addr0 same as TX_Adr for Auto.Ack
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0 If need more channel ,pls refer to age21
SPI_RW_Reg(WRITE_REG + RF_CH, 0); // setup channel is 2.4GHZ
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); //Setup reivce data length 20byte
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:2Mbps, LNA:HCURR
SPI_PORT|=NRFCE;
}
接收端代碼：
/*********************************************************************
** Device: nRF24L01+ RX **
** SPI*********** **
** CE - to digital pin 8 **
** CSN - to digital pin 9 (SS pin) **
** CLK - to digital pin 10 (SCK pin) **
** MOSI - to digital pin 11 (MOSI pin) **
** MISO - to digital pin 12 (MISO pin) **
** IRQ - to digital pin 13 **
*********************************************************************/
#include "NRF24L01.h"
//***************************************************
#define TX_ADR_WIDTH 5 // 5 unsigned chars TX address width
#define RX_ADR_WIDTH 5 // 5 unsigned chars RX address width
#define TX_PLOAD_WIDTH 32 // 32 unsigned chars TX payload
#define RX_PLOAD_WIDTH 32 // 32 unsigned chars RX payload
unsigned char status=0;
unsigned char TX_ADDRESS[TX_ADR_WIDTH] =
{
0x34,0x43,0x10,0x10,0x01
}; // Define a static TX address
unsigned char RX_ADDRESS[RX_ADR_WIDTH] =
{
0x34,0x43,0x10,0x10,0x01
}; // Define a static RX address
unsigned char RX_BUF[TX_PLOAD_WIDTH]={0};
unsigned char TX_BUF[TX_PLOAD_WIDTH]={0};
//***************************************************
void setup()
{
SPI_DIR = ( NRFCE + NRFSCK + NRFCSN + NRFMOSI);
SPI_DIR &=~ ( NRFIRQ + NRFMISO);
delay(100);
init_io();
init_NRF24L01();
Serial.begin(9600);
}
void loop()
{
nRF24L01_RxPacket(RX_BUF);
if((RX_BUF[1]==0x01)&&(RX_BUF[2]==0x02))
{
Serial.println("****************RX SUCCEED**********************");
Serial.print("RX_BUF[1]=0x");
Serial.println(RX_BUF[1],HEX);
Serial.print("RX_BUF[2]=0x");
Serial.println(RX_BUF[2],HEX);
}
RX_BUF[1] = 0x00;
RX_BUF[2] = 0x00;
}
//**************************************************
// Function: init_io();
// Description:
// flash led one time,chip enable(ready to TX or RX Mode),
// Spi disable,Spi clock line init high
//**************************************************
void init_io(void)
{
SPI_PORT&=~NRFCE; // chip enable
SPI_PORT|=NRFCSN; // Spi disable
SPI_PORT&=~NRFSCK; // Spi clock line init high
}
/**************************************************
* Function: SPI_RW();
*
* Description:
* Writes one unsigned char to nRF24L01, and return the unsigned char read
* from nRF24L01 during write, according to SPI protocol
**************************************************/
unsigned char SPI_RW(unsigned char Byte)
{
unsigned char i;
for(i=0;i<8;i++) // output 8-bit
{
if(Byte&0x80)
{
SPI_PORT |=NRFMOSI; // output 'unsigned char', MSB to MOSI
}
else
{
SPI_PORT &=~NRFMOSI;
}
SPI_PORT|=NRFSCK; // Set SCK high..
Byte <<= 1; // shift next bit into MSB..
if(SPI_IN & NRFMISO)
{
Byte |= 1; // capture current MISO bit
}
SPI_PORT&=~NRFSCK; // ..then set SCK low again
}
return(Byte); // return read unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_RW_Reg();
*
* Description:
* Writes value 'value' to register 'reg'
/**************************************************/
unsigned char SPI_RW_Reg(unsigned char reg, unsigned char value)
{
unsigned char status;
SPI_PORT&=~NRFCSN; // CSN low, init SPI transaction
status = SPI_RW(reg); // select register
SPI_RW(value); // ..and write value to it..
SPI_PORT|=NRFCSN; // CSN high again
return(status); // return nRF24L01 status unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_Read();
*
* Description:
* Read one unsigned char from nRF24L01 register, 'reg'
/**************************************************/
unsigned char SPI_Read(unsigned char reg)
{
unsigned char reg_val;
SPI_PORT&=~NRFCSN; // CSN low, initialize SPI communication...
SPI_RW(reg); // Select register to read from..
reg_val = SPI_RW(0); // ..then read register value
SPI_PORT|=NRFCSN; // CSN high, terminate SPI communication
return(reg_val); // return register value
}
/**************************************************/
/**************************************************
* Function: SPI_Read_Buf();
*
* Description:
* Reads 'unsigned chars' #of unsigned chars from register 'reg'
* Typically used to read RX payload, Rx/Tx address
/**************************************************/
unsigned char SPI_Read_Buf(unsigned char reg, unsigned char *pBuf, unsigned char bytes)
{
unsigned char status,i;
SPI_PORT&=~NRFCSN; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status unsigned char
for(i=0;i<bytes;i++)
{
pBuf[i] = SPI_RW(0); // Perform SPI_RW to read unsigned char from nRF24L01
}
SPI_PORT|=NRFCSN; // Set CSN high again
return(status); // return nRF24L01 status unsigned char
}
/**************************************************/
/**************************************************
* Function: SPI_Write_Buf();
*
* Description:
* Writes contents of buffer '*pBuf' to nRF24L01
* Typically used to write TX payload, Rx/Tx address
/**************************************************/
unsigned char SPI_Write_Buf(unsigned char reg, unsigned char *pBuf, unsigned char bytes)
{
unsigned char status,i;
SPI_PORT&=~NRFCSN; // Set CSN low, init SPI tranaction
status = SPI_RW(reg); // Select register to write to and read status unsigned char
for(i=0;i<bytes; i++) // then write all unsigned char in buffer(*pBuf)
{
SPI_RW(*pBuf++);
}
SPI_PORT|=NRFCSN; // Set CSN high again
return(status); // return nRF24L01 status unsigned char
}
/***************************************************
* Function: nRF24L01_RxPacket(unsigned char* rx_buf)
* Description:
* Receive data put into rx_buf
/**************************************************/
unsigned char nRF24L01_RxPacket(unsigned char* rx_buf)
{
unsigned char status;
unsigned char ret=0;
SPI_PORT&=~NRFCE; // chip enable
SPI_RW_Reg(WRITE_REG + CONFIG, 0x0f); // IRQ收發(fā)完成中斷響應，16位CRC ，主接收
SPI_PORT|=NRFCE;
delay(10);
status=SPI_Read(STATUS); //read status to judge if receive data
if(status&RX_DR)
{
SPI_PORT&=~NRFCE;
SPI_Read_Buf(RD_RX_PLOAD,rx_buf,TX_PLOAD_WIDTH);// read receive payload from RX_FIFO buffer
ret =1; //finish read data signal
}
SPI_RW_Reg(WRITE_REG+STATUS,status); //after receive data ,RX_DR,TX_DS,MAX_PT all set 1 to clear interupt signal
return ret;
}
/**************************************************
* Function: init_NRF24L01();
*
* Description:
* This function initializes one nRF24L01 device to
* TX mode, set TX address, set RX address for auto.ack,
* fill TX payload, select RF channel, datarate & TX pwr.
* PWR_UP is set, CRC(2 unsigned chars) is enabled, & PRIM:TX.
*
* ToDo: One high pulse(>10us) on CE will now send this
* packet and expext an acknowledgment from the RX device.
**************************************************/
void init_NRF24L01(void)
{
SPI_PORT&=~NRFCE;
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // Writes TX_Address to nRF24L01
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH); // RX_Addr0 same as TX_Adr for Auto.Ack
SPI_RW_Reg(WRITE_REG + EN_AA, 0x01); // Enable Auto.Ack:Pipe0
SPI_RW_Reg(WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0 If need more channel ,pls refer to age21
SPI_RW_Reg(WRITE_REG + RF_CH, 0); // setup channel is 2.4GHZ
SPI_RW_Reg(WRITE_REG + RX_PW_P0, RX_PLOAD_WIDTH); //Setup reivce data length 20byte
SPI_RW_Reg(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:2Mbps, LNA:HCURR
SPI_PORT|=NRFCE;
}
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